Most clubs have had some external funding in their history. Usually it's the demographic of the wealth that people only acknowledge. In the past we had fans of the club pouring their own personal wealth into their clubs and people will usually only cite Jack Walker for Blackburn because it is the Premier League era. Plenty of examples existed way before him.
It will be interesting to see with Monaco because they kicked up a fuss that the French authorities have taken away their tax free status. There are plenty of ways, on a national level, that clubs can gain advantages over clubs abroad.